Allow passing --cxx and --cxxflags to bootstrap.sh
#1097
+38
−13
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This allows selecting a specific compiler for building if e.g.
g++is not available but onlyg++-15.As
$TOOLSETisn't set in this case, unless passed by the user, that part of the project-config needs to be omitted. The alternative is to use "cxx" as whatbuild.shdoes but that might also not be what the user wanted.